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Investment (Income) , Net | 9 Months Ended
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Feb. 28, 2014
Investment (Income) , Net | NOTE 5 — INVESTMENT (INCOME), NET Investment (income), net, consists of the following components:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | February 28, |  |  | February 28, |
(In thousands) |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Interest (income) |  | $ | (1,780 | ) |  | $ | (2,179 | ) |  | $ | (4,924 | ) |  | $ | (6,039 | )
(Gain) on sale of marketable securities |  |  | (4,646 | ) |  |  | (2,926 | ) |  |  | (7,070 | ) |  |  | (7,518 | )
Other-than-temporary impairment on securities |  |  | — |  |  |  | 44 |  |  |  | 161 |  |  |  | 608 |
Dividend (income) |  |  | (1,325 | ) |  |  | (1,256 | ) |  |  | (1,817 | ) |  |  | (1,706 | )
Investment (income), net |  | $ | (7,751 | ) |  | $ | (6,317 | ) |  | $ | (13,650 | ) |  | $ | (14,655 | )

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- Definition Disclosure of Other Nonoperating Income. + References No definition available. + Details
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Namespace Prefix: | rpm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration